The Infernal and Doomguard have the 90% creature avoidance that other pets do in patch 3.3. (Source)

We certainly don’t think pet resilience is useless. We are considering increasing it to 100% of master’s resilience to make up for the increased AE damage pets will take in PvP. We don’t want pets to explode on contact (neither do we want pet classes to be twice as difficult to kill) but we did think it was a little goofy and unintuitive that pets could just shrug off AE attacks in PvP. We’d rather make pets tougher against all types of damage than be vulnerable to some and nearly immune to others. (Source)